<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>统计成绩最大值和最小值</title>
</head>

<body>
    <script>
        var arr = new Array(83, 75, 65, 59.5, 92);
        var sum = 0;
        var max = 0;
        var min = 100;
        for (var i = 0; i < arr.length; i++) {
            sum = sum + arr[i];
            if (arr[i] > max) {
                max = arr[i];
            } else if (arr[i] < min) {
                min = arr[i];
            }
            console.log(sum)
        }
        document.write('5门成绩分别是：' + arr + '<br/>');
        document.write('总分是：' + sum + '<br/>');
        document.write('平均分：' + (sum / arr.length) + '<br/>');
        document.write('最高分：' + max + '<br/>');
        document.write('最低分：' + min)
    </script>
</body>

</html>